George Clooney, Gladys Knight and U2 among Kennedy Center honorees

A heartfelt Patti LaBelle praised her lifelong friend Gladys Knight. Sean Penn called U2 "four scrappy Dublin punks." Ballet dancers performed for conductor and composer Tania León. Matt Damon playfully teased his friend George Clooney — a lot — while Sheryl Crow delivered a heartfelt rendition of "Baby Baby" to Amy Grant during Sunday's Kennedy Center Honors.

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